Error when creating new site, folders not created

Hi everyone,
recently I've encountered a big problem.
When I add a new website or a new client, no folder are created.
I've 2 website already running without problems, but at this moment I can't add anymore.
My configuration:
ISPC 3.0.5.4p8
Debian Jessie
Any ideas?
Thanks...
EDIT: after activated debug mode, I notice that the Job Queue is not processed.
I've killed the process, removed the .ispconfig_lock file and start server.sh.
This is the log: